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XROOTD-L  February 2008

XROOTD-L February 2008

Subject:

Re: Proof performance with different storage schemas

From:

"Andrew Hanushevsky" <[log in to unmask]>

Date:

20 Feb 2008 15:54:12 -0800Wed, 20 Feb 2008 15:54:12 -0800

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text/plain

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text/plain (110 lines)

Hi Pablo,

Actually, we (as well as other sites) do exactly what you say -- run 
hundreds of terabytes with multiple access methods (xroot prefered because 
it scales the best). We'e been doing that for years. So, I don't understand 
why you think that it's not about that.

Andy

----- Original Message ----- 
From: "Pablo Fernandez" <[log in to unmask]>
To: "Fabrizio Furano" <[log in to unmask]>
Cc: <[log in to unmask]>
Sent: Wednesday, February 20, 2008 7:05 AM
Subject: Re: Proof performance with different storage schemas


> Hi Fabrizio,
>
> I think (and I won't be wrong) you can have better performance with native
> xrootd (since you forget about other elements slowing down the system). 
> Maybe
> for some Tier3 that would be the case (those far away from it's Tier2), 
> but
> at least for us it's not realistic. We're speaking of hundreds of 
> Terabytes
> and many access methods (srm, gsiftp...) and I don't think a native xrootd
> cluster is about that.
>
> Regards,
> Pablo
>
>
>
> On Wednesday 20 February 2008 13:27, Fabrizio Furano wrote:
>> Hi Pablo,
>>
>>   I see your point. I was mentioning the orthodox xrootd anyway, not the
>> xrootd door, which from my point of view is just an emulation. After
>> all, this is the xrootd mailing list :-D
>>
>>   For lustre I am not an expert, from a pure functional standpoint you
>> can put an xrootd server exporting the lustre mountpoints I guess. In
>> that case you will not go beyond the lustre performance of course.
>>
>>   Fabrizio
>>
>> Pablo Fernandez ha scritto:
>> > Thanks!
>> >
>> > Unfortunately the xrootd protocol does not work as expected in dcache.
>> > The idea was to use a conventional SE to store all the data for Tier2 
>> > and
>> > also serve files to the Tier3... I don't know if Lustre implements an
>> > xrootd door as well, maybe in a few months I'll try that.
>> >
>> > BR/Pablo
>> >
>> > On Wednesday 20 February 2008 11:40, Fabrizio Furano wrote:
>> >> Hi Pablo,
>> >>
>> >>   that's very interesting, and I agree completely with your 
>> >> conclusion,
>> >> i.e. in most cases the lan data access is more efficient and scales
>> >> better with respect to local disk access. Many times this is not very
>> >> well understood by people, always striving to keep local files at any
>> >> cost.
>> >>
>> >>   It would be very interesting to have a comparison between the
>> >> performance in proof between a dcache storage and an analogous xrootd
>> >> storage, which is the default solution for that. With the same pool of
>> >> workers of course.
>> >>
>> >>   From what I've understood, dcache uses a read ahead mechanism (at 
>> >> the
>> >> client side), while xrootd uses a scheme which is mixed with informed
>> >> async prefetching.
>> >>
>> >>   Fabrizio
>> >>
>> >> Pablo Fernandez ha scritto:
>> >>> Hi all,
>> >>>
>> >>> I would like to share with you some information about my testings of
>> >>> performance in Proof with different storage schemas.
>> >>>
>> >>> http://root.cern.ch/phpBB2/viewtopic.php?t=6236
>> >>>
>> >>> I have translated this topic to the Proof Forum since seems to me 
>> >>> more
>> >>> Proof-related than just xrootd, I hope you don't mind.
>> >>>
>> >>> BR/Pablo
>
> -- 
> ==============================================================================
> Pablo Fernandez Fernandez             e-mail: 
> [log in to unmask]
> Dpto Fisica Teorica. C-XI.
> Facultad de Ciencias
> Universidad Autonoma de Madrid.                          Phone: 34 91 497 
> 3976
> Cantoblanco, 28049 Madrid, Spain.                          Fax: 34 91 497 
> 4086
> ==============================================================================
> 



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